ARM: EXYNOS4: Add support MCT PPI for EXYNOS4212

This patch implements clock event timer using MCT PPI
and make EXYNOS4212 use MCT PPI instead of MCT SPI.

Signed-off-by: Changhwan Youn <chaos.youn@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

3 files changed, 53 insertions, 10 deletions

diff --git a/arch/arm/mach-exynos4/include/mach/entry-macro.S b/arch/arm/mach-exynos4/include/mach/entry-macro.S
index d7a1e281ce7a..61393dcf5559 100644
--- a/arch/arm/mach-exynos4/include/mach/entry-macro.S
+++ b/arch/arm/mach-exynos4/include/mach/entry-macro.S
@@ -80,4 +80,10 @@
                 /* As above, this assumes that irqstat and base are preserved.. */
 
                 .macro test_for_ltirq, irqnr, irqstat, base, tmp
+                bic     \irqnr, \irqstat, #0x1c00
+                mov     \tmp, #0
+                cmp     \irqnr, #28
+                moveq   \tmp, #1
+                streq   \irqstat, [\base, #GIC_CPU_EOI]
+                cmp     \tmp, #0
                 .endm
diff --git a/arch/arm/mach-exynos4/include/mach/irqs.h b/arch/arm/mach-exynos4/include/mach/irqs.h
index f8952f8f3757..2d3f6bcd9bc0 100644
--- a/arch/arm/mach-exynos4/include/mach/irqs.h
+++ b/arch/arm/mach-exynos4/include/mach/irqs.h
@@ -19,6 +19,8 @@
 
 #define IRQ_PPI(x)              S5P_IRQ(x+16)
 
+#define IRQ_MCT_LOCALTIMER      IRQ_PPI(12)
+
 /* SPI: Shared Peripheral Interrupt */
 
 #define IRQ_SPI(x)              S5P_IRQ(x+32)
diff --git a/arch/arm/mach-exynos4/mct.c b/arch/arm/mach-exynos4/mct.c
index ddd86864fb83..f43f3faa6495 100644
--- a/arch/arm/mach-exynos4/mct.c
+++ b/arch/arm/mach-exynos4/mct.c
@@ -20,12 +20,23 @@
 #include <linux/delay.h>
 #include <linux/percpu.h>
 
+#include <asm/hardware/gic.h>
+
+#include <plat/cpu.h>
+
 #include <mach/map.h>
+#include <mach/irqs.h>
 #include <mach/regs-mct.h>
 #include <asm/mach/time.h>
 
+enum {
+        MCT_INT_SPI,
+        MCT_INT_PPI
+};
+
 static unsigned long clk_cnt_per_tick;
 static unsigned long clk_rate;
+static unsigned int mct_int_type;
 
 struct mct_clock_event_device {
         struct clock_event_device *evt;
@@ -321,9 +332,8 @@ static inline void exynos4_tick_set_mode(enum clock_event_mode mode,
         }
 }
 
-static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
+static inline int exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
 {
-        struct mct_clock_event_device *mevt = dev_id;
         struct clock_event_device *evt = mevt->evt;
 
         /*
@@ -335,7 +345,20 @@ static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
                 exynos4_mct_tick_stop(mevt);
 
         /* Clear the MCT tick interrupt */
-        exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
+        if (__raw_readl(mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1) {
+                exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
+                return 1;
+        } else {
+                return 0;
+        }
+}
+
+static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
+{
+        struct mct_clock_event_device *mevt = dev_id;
+        struct clock_event_device *evt = mevt->evt;
+
+        exynos4_mct_tick_clear(mevt);
 
         evt->event_handler(evt);
 
@@ -384,13 +407,17 @@ static void exynos4_mct_tick_init(struct clock_event_device *evt)
 
         exynos4_mct_write(0x1, mct_tick[cpu].base + MCT_L_TCNTB_OFFSET);
 
-        if (cpu == 0) {
-                mct_tick0_event_irq.dev_id = &mct_tick[cpu];
-                setup_irq(IRQ_MCT_L0, &mct_tick0_event_irq);
+        if (mct_int_type == MCT_INT_SPI) {
+                if (cpu == 0) {
+                        mct_tick0_event_irq.dev_id = &mct_tick[cpu];
+                        setup_irq(IRQ_MCT_L0, &mct_tick0_event_irq);
+                } else {
+                        mct_tick1_event_irq.dev_id = &mct_tick[cpu];
+                        setup_irq(IRQ_MCT_L1, &mct_tick1_event_irq);
+                        irq_set_affinity(IRQ_MCT_L1, cpumask_of(1));
+                }
         } else {
-                mct_tick1_event_irq.dev_id = &mct_tick[cpu];
-                setup_irq(IRQ_MCT_L1, &mct_tick1_event_irq);
-                irq_set_affinity(IRQ_MCT_L1, cpumask_of(1));
+                gic_enable_ppi(IRQ_MCT_LOCALTIMER);
         }
 }
 
@@ -404,7 +431,10 @@ int __cpuinit local_timer_setup(struct clock_event_device *evt)
 
 int local_timer_ack(void)
 {
-        return 0;
+        unsigned int cpu = smp_processor_id();
+        struct mct_clock_event_device *mevt = &mct_tick[cpu];
+
+        return exynos4_mct_tick_clear(mevt);
 }
 
 #endif /* CONFIG_LOCAL_TIMERS */
@@ -419,6 +449,11 @@ static void __init exynos4_timer_resources(void)
 
 static void __init exynos4_timer_init(void)
 {
+        if (soc_is_exynos4210())
+                mct_int_type = MCT_INT_SPI;
+        else
+                mct_int_type = MCT_INT_PPI;
+
         exynos4_timer_resources();
         exynos4_clocksource_init();
         exynos4_clockevent_init();